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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365414d72ba904000221e78e0dddc5b2847762e23aa8d1461b6f27f92c4c90a4' 
  AND token = 'lTr9tC4xTTM8ypP1VJqgQyJYeY7/nFnatg80B7ulShg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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