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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928176c691f62df1ab50a32cf059ca6a375a05f3e0684ec52d66d1387f8edec1' 
  AND token = 'xyS/bjWbee1m8PhrT88pWigqELy/nIXAwYffgeTD9UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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