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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b14c51d9deed4e85ae984c7dbe59cbbcd7010c091e7393c5334ccc235fb4d64' 
  AND token = 'eUUfv1iE4Rr3wIsrqgBf53GNealZG3LMJZJXaX14dFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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