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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30bdc48d17a5bb614bdbdcfe201d6c82abd59c60f279a81f08bc9a1e665ac1d' 
  AND token = 'R9/LX60+1PKaNDO4XSa9aundMdvYloCeRhr9rvKC9vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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