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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ab59d11813b0f2e71412f486022a06a97b1ba06a6838ffff1cf081dd134602' 
  AND token = 'jnUW4CiaA1R49r1N6dFlxgZRsUejcN05r3nODx+Yt0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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