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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bbbb79ce89a57dcb2d47379e45826bf2bd922321a7ff2d630dc28d59834662' 
  AND token = 'Okbcm426voUp7xVuFl98tPbvGL2y1nC191dWexM+Yvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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