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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9857141c2b3431580421cb8e3dc335048ccc7e3cfcaa66f1eade76db08a17812' 
  AND token = 'b4jefPTb8wAiCtLTleujmfgG4CD3Vhx8EntzTrr8VqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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