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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea49393d11a493ca174d3ed788f4f5619c5996397babe0808adcedcedc9d7595' 
  AND token = '4Lwie96p8qD4pXnOYGzzgsmhOGl5kcuRmcTV405ftDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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