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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539b30c6c2b647c7c99dad955ecdb2cbb1748b849f64ad387173f85a58bbad01' 
  AND token = 'K0Ko9m2O72ejB346/RicQG9oUASv8QICFdF+9NBSbpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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