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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28b57f13ea04363ce65f83fb75b0a4ef36c052497b113c2b11a6ef7b3495e49' 
  AND token = 'SL4kQyaH59KaOcod8qkzj8oi3nC34pf9V/I0Tp6hCF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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