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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cb5fc71a4b0460726f49c4ee6ad76dae73a96e150fd833369d749ad9836b9c' 
  AND token = 'Xs5rP1rL0WLtTAgWyq8GtDKL4dnZRaQTEZ1vzMjg7ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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