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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a3f177565fe19e69f4634ef6bdcf5b5bd95f61012f82b6915b1887a3ed9fe3' 
  AND token = 'CYRTk+Yj9my57wwlzJvytCPBlfc8dAurh8h2b0aIBDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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