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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ea124073cae464d7a76d493811fe484168cb8c28fec15e1c943c893ca4b396' 
  AND token = 'qNjdUaN1fvcd7gRvSZDcXnIb0lRY3EiE3M7IVOnse1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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