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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7df05c470aa8a3165d277ef94615a3a92bbf4832ab57fa1908c124692c8c75' 
  AND token = 'Hn9jMSU+7499z8gUbDiTcu4+cjihdzxDtP9guyMVgF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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