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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067510792071847e7766fc3a5c8f74c052f53d6a197cb26616e0ee82a720d254' 
  AND token = '02aL4b8wXP8QZuLoIzTqk8VrkCthd+v54gPF5Ex4NQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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