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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f99c6fe3ec03c73c8014950a6e1357fc7bb3369377865930f476bc41e693df0' 
  AND token = 'nx2MPSQ8ZuSeOfMOo3wSQx+slTTELcvFQOG2MrurrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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