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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc5b38a0244356554553ba11a830cef45d22fba8d8a288a85e1cd4975f4200d' 
  AND token = 'MSWztmckjUjw1y5jLI36KgbY4S3wlPIJjzI8FRz7OA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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