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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fe4117efa98bd75d0d21c34f69274a482d1e8ca4ebf8c7fdb68660ef776f11' 
  AND token = 'EYy8dz4eG8V9sx5OEO8/RAi8qdIG/hw3I11f68CRFhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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