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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abf931f51a648145d568c15b3bdd8c81a8bfdfd9b4cf552081126ce9f6dcc43' 
  AND token = '3mGrsJ8hXigYTR2d6KIikROKjjz0FUP1FgsS3QP8828=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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