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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3529861dfbe9e4d978023e3174535096f13e98a0b7ae6933bc1a9e014e94374' 
  AND token = '/pu6fhmVuZJ/x9T818sWN/aYjAtwydEFKsEG2etpBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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