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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba0ad516355e0556d4d05e0f62c34f05cbd71db71470791d7ce6e8300d4c872' 
  AND token = 'L8qNpWjOVgrld+j4MQfe92CrWcQ2vFDHT6iOoLO0/dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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