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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cc7e38e45ed15cdc333b4a434285e50c12b6f2de7ef40a46069eedaf2ea3fb' 
  AND token = 'mTnNYmOgKcQFeD2t1Xuan8xEsTL+ky4WYI1urZ2CVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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