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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47aa554b66ecfe9d185da4c4cc27842742e90a8c0a76eb728d4d03208ed259ef' 
  AND token = '/cFr1dnpCtIpcTZUsl9B/T/hy+cV41HnQ5n6eLm7suE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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