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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ee873564c9f33ec40bb67dcf227558d0587c5b3b2b03a779b9d88de60aefc2' 
  AND token = 'aSlWitlPs2PwWum72aCzaBFvRu6cHWG9W3M+cSk9ah0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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