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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3a0bc4ecf8684e6acc868942f2c0e02811543446b4f01093e5cb17ef1159ff' 
  AND token = 'yf08ija3deIQFYKlBv/NVliojt53lAVD4Ng7Z4QWVJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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