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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a95165148c72dec5d32e9158f54a7e82da09a762bee9e15f68a2ff75f4b2e3' 
  AND token = 'iU6/Ek+nQSo7r1uraqn0j0pex9x+wZE8KkDpn5DhVNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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