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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8998ddd38f6a8e6d7b1e8d78a301de3f440665017391bc21eec13af4ce738b9' 
  AND token = '/ywMRHKLt13k14XFeFiSpNzNPx2Zx5uXcbvXEMW8hd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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