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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e88f0e6a77c39e6efccceff0257530f9e04f3155d57123c5c9afe41fff54705' 
  AND token = 'VDuL4NSrzefoPiFSb+EWPo2aa7tIxyzvPK0bzAtXRo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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