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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efa009242b95e2645fe3f88bdff7ca6cd653197e16ce0f4b944d41e16b71ba6' 
  AND token = 'Gs7HIkUOv/CwM25PrGeIdzhYx/VtgdkMNO2yJ7zury4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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