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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd37ed2ebe4d0e739231bb2bcd7a15b44da9fe85227caae0292e6ddfa21ce6a7' 
  AND token = 'vKufOLz6OfHO6Ls3JWTqOdCxTbSf2IjM7KnXO0koDuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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