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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d5a799e8b52c8aa55f44f23e2b511e1bfe035e4eb7730bada6d58a56883059' 
  AND token = '0CFOI/1urxDuEv1Mfbs43LSB8Yyvq5DkLu1r5rRwjXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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