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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0abbc7597c1ba7e02b92f90ee8da0540d5eaf52c7dffb5243f2d3dbd2c580e' 
  AND token = 'sBaYWIx6LwAjMMiMyacOOK6AgiyIfZIlZTm7x3/3v2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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