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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa44268c1dd0884ab6a1a9f906c421feb516ed6fd3b2adbc0db1a3acd645d204' 
  AND token = 'dU9ghYWqYwzSpQmNshust/UbX7S/XrGxPCN+PI2za2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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