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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5836434c4d3e89031567f853e4c48b415aafe88fa2c9c6ad51e10021b6fabd8d' 
  AND token = 'WbUAe3x5Y7nX8uy8YAnVSRCW20ZoxXtVCPSRxiDptec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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