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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c017e1979ad8832f9a7e5425c82de3e886e9555357eefb71ac1eb3aa99c478a1' 
  AND token = '+hBL+4A1GHvfcFwAmmvr9lKBahyvW1J1swsLTlIxnaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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