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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6040a5499d2f5ea520543ba47366ffd81b6b61ff7acce5e24c23285714bddd01' 
  AND token = 'dd5Do4l9KvBGcvq8VYt8RFBu4eN+RRVvpcI2H5FFies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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