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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaacae6273bff041d544e0da27bc7f5825159907f0f20a4987ed4fd719fa41b4' 
  AND token = '15Rr1bTo7qXhq8AYF8C7eXs369VSSNU+2esnIbSjwYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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