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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcfaa83265497391ffde62e88e81b4b10e32ca7498cc0f9fb6c75a5269f51ee' 
  AND token = 'tNtE62zPDh0YH331lMJNKmMYf50HLR9lA95fjy9h5R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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