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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1031f68c6452ef386258de8b3a70c831d9a0b55b16302209a32d6e37f34aa3' 
  AND token = 'aT5ENQX7S8CS+sL3h6T9Tpj1OTkvN7W3dW53Vegl5DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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