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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ab806de33be6a1b16fd2fff60652c5596a7d285b137ea82e73d580ab4564e4' 
  AND token = 'v5btRR0KtGGsCFJ79i9ZjuReO+iQU3WAhMFM5bab3Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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