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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634bcc4e8b4d98f34bdec4ab9a90e82caa4a7007c98e4af82a20b6d903e182b6' 
  AND token = 'wAoJ8CwCzrlOS5s1f02XG8FZ5gupJZgNXnnjMDh1CeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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