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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10c2fd34a2f28ca91803fe5ece598bf83f063999141c0f9618348e4f9244943' 
  AND token = 'uYm0krkE9Htf/3ERGigtkpacYXqz86Gz4qxEYrue9bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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