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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2a35183b50a7bd2af7a81088d45c058c76ad9bad78723a0fb7cc83cbf92611' 
  AND token = 'B/+fb1aUReDsr6uMLht81/av52tol/gbOu/Iaabgd7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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