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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887b980d5e72451ee0c74e6464e2c9c2b93d24d3fd1c01ed0de0b9298340a35a' 
  AND token = 'dRkdfCwntta0C+azsHBV7kX5+zc0YwJqtTMM1dWCbUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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