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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322e74fb833e4649ae9be7d9f0287858d46eeb8932107e5a635f4baa0565c008' 
  AND token = 'Lj79yHQ7ynetgPE03t5WYJoJTqR8A3BFBS9bZcnH1RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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