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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d89b941552b7d52464dc6e92befea0edc97ca2efa2c06f12c3c3aec3e941d7f' 
  AND token = 'bFiJVv8eXQn8Xah3LAow9siZwpqjpqlvVtkMyfdZnro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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