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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92590356c578e6c74e5a8a09ca85d2f54d334b435184f8ec84ca28f19ca69369' 
  AND token = 'cEoM5NKoZ4n+1ytbEtxWM9qcM8/O84apyW82b3g3BU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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