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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47347b1e61f06b7d572d6e89650f4cd63fa4ad859a8357dda907665a92236b38' 
  AND token = 'k1q5DXJvxoWqwS1U3JLuZZmopkLDFam4nZoaxy1P9xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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