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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9015649d564f3090dcc67c5fd77d710779d0b3e53600b5c56af9d6b5c1e92fc' 
  AND token = 'Gn8fsxaPaW/uZ60QaNWofyfTeEnx0ySRcpDSwxie/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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