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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ecf4f40b40af763f00fb0f3b46e634750215dcdb88692b6dbbfd2fb058eeb0' 
  AND token = 'PH17SOBO+6hIpzyMcAjcuW8CncbPIZy89+0IfVD9qE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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