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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce01cd4f1f682ba28d964213642cc84c6964cee0f5c0585b95fdf2bc1612051' 
  AND token = 'MrKV1QZoGY1MfTA61HnIHdPWRp1ehYkgjczyg1UlJQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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