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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a784e2a45ea54bc49978f0ff9921671bdf70b4667bf8617700dea4df7695321' 
  AND token = 'N8g2mkQhemAmIlvVDyz+y3SR/IlqGYzl600Gr1drSEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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