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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9f7e772c47d4ae0e140ebfaafc5c23f78c881bce38d7624f343e2412b25e54' 
  AND token = 'CcZwWid9YlU6h2X+jhcSZxzu7lYTLH/5lTv4e9notQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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