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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55416bc0d8461c63c90bbf021816e41875109998b2d3769482f72086f5d7a724' 
  AND token = '0Mql8lzBMB1CmaOmyBIRK4K2cTRX2R/MxgmJDDUAFyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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