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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c07f7a33888e2bd056d6111ef97f77714887dcda084c104ddc39689ec9f48e' 
  AND token = 'ybMp1uwCKIVeCsxujgPcHN1LXF9gd2PqO7bChSTjnZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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