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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615ab6e39aaf5849c9f7a975b0a62bd52bc919485c1aa39e7be9fe7f0eaa2920' 
  AND token = 'wPPJjq0HpNlMq06UkpajKHigjvUjv8t6G3nR1VI5Y+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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