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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95edecc503709dbfd48e9305b0ae644082dc12d79a087379fa01803b2b66580' 
  AND token = 'jkx7w7vNUDw5FIhrbpCcA75Ud7M2pI6vInpkPrbsB8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}