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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93423749b4121b86cd51a160a4537b7b1de45e2c57d727144b8f25f0c980815f' 
  AND token = 'ksjmMo79EB5SChJs6yYLTcMwTu5uyNE33yjd965qYVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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