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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c9c1b454502afb74b10b9d9db0d3eb607987cef4facaf2e1584b814a1f62a5' 
  AND token = 'dRfoSJx8COzhC/DSfBLCn4Ps4iADerzTYm6ahD8UM7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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