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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8857e5931d02da8d8173f32ec5a2c015d5a55444c6fb450052eafe2a70b678ec' 
  AND token = '/jLFXTNYIYu6HbWGSrKuyPJ72gyPDqjHriNdmC48W30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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